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There's a lot of booster lines going here and there. I think on my Taurus, I tapped into one of the vacuum lines going to the EGR purge solenoid (I think ... that was nearly 10 years ago ...).
Follow the vacuum lines, there is most likely going to be a service port covered somewhere that you can tap into..
For the oil pressure switch, I'd look near the oil filter. That's where the vehicles oil pressure switch is and there are usually some lines that you can tap into. I've seen on Cherokees and Focuses, people add them right by the oil filter.
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